/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.myfaces.config.annotation;

import org.apache.commons.discovery.tools.DiscoverSingleton;


import javax.faces.context.ExternalContext;


public abstract class LifecycleProviderFactory {
    protected static final String FACTORY_DEFAULT = DefaultLifecycleProviderFactory.class.getName();

    private static volatile LifecycleProviderFactory INSTANCE;

    public static LifecycleProviderFactory getLifecycleProviderFactory()
    {
        LifecycleProviderFactory instance = INSTANCE;
        if (instance != null) {
            return instance;
        }
        return (LifecycleProviderFactory) DiscoverSingleton.find(LifecycleProviderFactory.class, FACTORY_DEFAULT);
    }


    public static void setLifecycleProviderFactory(LifecycleProviderFactory instance) {
        INSTANCE = instance;
    }

    public abstract LifecycleProvider getLifecycleProvider(ExternalContext externalContext);

    public abstract void release();

}
